Disconnecting Google from profile
How can I disconnect my Duolingo profile from Google? Sincerely thanks for your answer.
You can do that from your Google account settings:
(1) Log in to your Google account.
(2) Click on the user profile icon ( top right corner of Google's homepage) then click My account.
(3) Under Sign-in and Security choose Apps with account access. You should see a list of the accounts connected to your Google ID.
(4) Click on MANAGE APPS.
(5) Choose the desired account (in this case duolingo) then hit the REMOVE ACCESS button.
Do you know if I can change the email address associated with my account.
You can do that easily:
Hover over your username, then from the drop-down menu, choose Settings. That will lead you to your account settings including your email address. Making any edits will activate (change to green) the Save changes button. You will be required to go through the email verification process every time you change your email address.
Arachnje has already described what to do in your Google account.
In case you don't have a regular login here on Duolingo yet, just hit "forgot password" during the login process. Make sure your e-mail is working correctly because you'll get a mail with a link so that you are able to choose a password.